Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b2b746aa9bd679…

MALICIOUS

PDF

66.6 KB Created: 2021-03-28 12:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b2aab104fb299fe99d1f654a62c78858 SHA-1: b158f0148be84fe1ea08864028bd4a804317ca07 SHA-256: 58b2b746aa9bd679c06711329fbd082bb06e68bdcbbc4373d88bd9d789c711af
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/wix?keyword=edward+mead+earle+makers+of+modern+strategy+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388841/normal_602d5c33a85df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450640/normal_6003dd47eb23c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_604e790930dc6.pdfIn PDF document text
    • https://tudisapa.weebly.com/uploads/1/3/4/6/134660317/cd70c26d.pdfIn PDF document text
    • https://budovatepita.weebly.com/uploads/1/3/1/3/131398204/nikukowotoluvavexaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_6012763a66b39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_600c3a52c28e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_602c82973e4dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_60217332ba68b.pdfIn PDF document text
    • http://lofupijuwox.22web.org/tiromeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488100/normal_6058d8bb9b29f.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/masozat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444366/normal_6037183d0125e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501989/normal_6033901e0534d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e647d2-d076-4017-af6a-a95979119d11/study_bible_for_pc_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f430df94-53e0-450c-962e-32eb9bcd8642/59509397337.pdfIn PDF document text
    • http://moduvodaw.epizy.com/mental_health_first_aid_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102fa990-8f2e-46a1-8766-ad113567999a/washington_redskins_schedule_1979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96dc3d8e-6810-4e18-bcb7-575278df358f/60515042773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b869693-b807-4dbd-9b97-6edbdd6fc3f2/35418015565.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 5576 bytes
SHA-256: 6efb73136de44d31348fac8e0e0c695aedcd9389d27a116c67e4e60d86290929
font_01_sfnt_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 10448 bytes
SHA-256: 22128915c6736ccb0b795e25a10be896513a245e3b6a25964548722feff0cc8d

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